Attachment for grindstones



(No Model.)

W. OHALMBRS.

ATTACHMENT FOR GRINDSTONES. N0..30O,845. Patented June 24, 1884.

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Ilrvirnn STATES PATENT tries.-

IVILLIAM OHALMERS, OF DETROIT, MICHIGAN.

ATTACHMENT'FOR GRINDSTONES.

QPECIPICATION forming part of Letters Patent No. 300,845, dated June 24-, 1884:.

Application filed November 3, 1883. (N model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM CHALMERS, of Detroit, in the county of IVaync and State of Michigan, have invented new and useful Improvements in Attachments to Grindstones; and I do hereby declare that the following is a full, clear, and exact description thereof, reference beinghad to the accompanying drawing, which forms a part of this specification.

The nature of this invention relates to certain new and useful improvements in attachments to grindstones, by means of which the stone is hung, and the edge-tool to be ground is adjustably supported and presented to the face of the stone in the most favorable manner to produce the most perfect results.

The invention consists in the peculiar construction of the parts and their combinations, as more fully hereinafter described and claimed.

In the accompanying drawing, which forms a part of this specification, my invention is shown in perspective, with a portion in dotted outlines the better to show the construction and operation of the various parts.

In the drawing, A represents a grindstone frame of the usual construction, wherein the stone B is hung upon a shaft, 0, which is designed to be driven from any suitable source of power, and all in the usual way. An ec centric, D, is secured upon said shaft between the stone and one of the boxes in which the shaft is journaled.

E is a rod connecting said eccentric with the lower end of the oscillating frame, which is composed of the vertical arms a and b, which are pivotally secured to the brackets F F.

The arm a is longer than its fellow, in order to form a suitable connection with the eccentrio-rod. The brackets F F are provided with any suitable and known devices which will. allow them to be longitudinally adjusted with relation to the frame to which they are secured. The arms a and b are also provided with any suitable and known means by which they may be vertically adjusted with relation to their pivotal points. arms a and Z) are curved inwardly toward the main shaft, as shown, forming an overhang, and between their ends, or to them, is pivot- The upper end of the ed the tool-holder, which is composed of the heads 0 and d, coupled together by the crossbar G, the front end of which is designed to rest upon the tool presented for sharpening, and which rests in or upon the forward ends of the heads.

i This device, constructed substantially as described, is peculiarly adapted for grinding harvester-cutters, and in this case the construction presented is the one I desire to use upon a stone with two beveled faces; but, if desired tobe used for grinding axes or smaller tools, the necessary adjustment or change may be made in the head, without departing from the spirit of my invention, to adapt the tool-holder to hold the device to the stone, substantially as described above. Of course, for straight-edge tools afiatperiphery of the stone would be preferable, while the double-beveled periphery, as shown, is more preferable in grinding the harvester-knives. By this arrangement it will be seen that the various adjustments may be had which will enable the device to be used for nearly or quite all the purposes required in grinding all kinds of tools requiring cutting-edges, and the tool will be advanced and receded upon the periphery by every revolution of the crank through the operation of the eccentric, giving, as nearly as is practical, the various movements always employed by an expert in grinding tools, using the hand as the tool-holder.

hat I claim as my invention is 1. In combination with a grindstone and its frame, a tool-holder constructed to present the tool to the stone, ancccentric on the main shaft, and means, substantially as described, for connecting the tool-holder with said eccentric, whereby a combined rocking and reciprocating movement in the direction of the movement of the surface of the stone is given to the tool, as described.

2. In combination with a grindst'one-frame the shaft of which is provided with an eccentric, a rod connecting such eccentric directly with a tool-holding frame pivotally secured to the main frame,substantially as and for the purposes specified.

3. In combination with a grindstone-frame the stone-supporting shaft'of which is procarrying frame is pivotally secured, a toolholder pivotally secured thereto, substantially as described.

5. A grinding apparatus composed of a stone, shalt, and frame, of any usual construction, an eccentric on said shaft, a rod connecting with said eccentric, an oscillating tool-holder-earrying frame, and a tool-holder pivotally secured to said tool-holder-carrying frame, the parts being constructed, combined, and operating substantially as and for v the purposes specified.

\VILLIAM CI-IALMERS.

XVitnesses:

E. SoULLY, l1. S. SPRAGUE. 

